/*
 *
 * scanZeroPad.cuh
 *
 * Utility functions to deal with shared memory when zero-padding
 * the warps (or not)
 *
 * Copyright (c) 2011-2012, Archaea Software, LLC.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions 
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in 
 *    the documentation and/or other materials provided with the 
 *    distribution. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef __SCAN_ZERO_PAD_H__
#define __SCAN_ZERO_PAD_H__

template<bool bZeroPad>
inline __device__ int
scanSharedIndex( int tid )
{
    if ( bZeroPad ) {
        const int warp = tid >> 5;
        const int lane = tid & 31;
        return 49 * warp + 16 + lane;
    }
    else {
        return tid;
    }
}

template<typename T, bool bZeroPad>
inline __device__ __host__ int
scanSharedMemory( int numThreads )
{
    if ( bZeroPad ) {
        const int warpcount = numThreads>>5;
        return (49 * warpcount + 16)*sizeof(T);
    }
    else {
        return numThreads*sizeof(T);
    }
}

#endif // __SCAN_ZERO_PAD_H__
